Aboard the Diamant, the commander saw the burning cloud descend and ordered the engines thrown into reverse. People onshore, realizing what was coming, rushed into the sea and tried to scramble aboard. The boilers, pushed beyond their limits, exploded. The ship sank instantly. Of roughly forty people aboard, one survived: a cabin boy named Innocent Jean Baptiste. He later described sinking with the ship without seeing anything, without understanding how he ended up in the water. He dove repeatedly to avoid the hot ash raining from above, his strength draining with each submersion, until he reached shore and was thrown back into the sea. He clung to floating wreckage until the French cruiser Suchet plucked him out hours later. Farther out in the harbor, the Roraima -- a 2,712-ton iron steamship built on the Clyde in Glasgow -- burned for three days before sinking. Of its 68 passengers and crew, eleven survived. Among them was Clara King, a Black nanny from Brooklyn, who emerged from the inferno carrying eight-year-old Rita Stokes. Rita's mother Mary, her four-year-old brother Eric, and her three-year-old sister Olga did not survive.

A 1904 report by the National Establishment for Disabled Marines attempted to count the losses. The port administration's archives had been incinerated along with everything else, so investigators relied on statistics and testimony. They estimated at least 386 French ships and boats destroyed -- mostly coastal vessels and fishing boats -- along with 500 crew members and 33 passengers. The ships burned and sank where they sat at anchor, the pyroclastic surge igniting wood, canvas, and cargo in seconds. Among the foreign vessels caught in the harbor was the Italian barque Nord-America, a three-masted sailing ship of 558 tons from Castellamare di Stabia, loading cargo for Bordeaux with a crew of thirteen. The British cable-repair ship Grappler, which maintained the Guadeloupe-Martinique telegraph line, was closest to shore and likely capsized before sinking. Its wreckage has never been found. Legend holds it carried not just copper cables but gold from wealthy planters preparing to flee -- a treasure that still fuels searches today.

Not every vessel in the area perished. The Belem, a three-masted sailing ship, was supposed to anchor in the harbor that morning. But the Tamaya had already taken the Belem's planned spot, and there was no room. Captain Chauvelon reluctantly diverted to the town of Robert on Martinique's Atlantic coast. The eruption buried the Belem in ash and stones, covering its upper works in caustic mud as hard as mortar, but the ship survived. After the blast, the Belem's crew sailed back toward Saint-Pierre and rescued survivors from the water. The Roddam, a British ship commanded by Edward Freeman, had anchored at the harbor's outermost edge. Freeman saw the burning cloud descend and managed to get underway. He arrived in Saint Lucia with his deck completely burned, himself wounded, and only two men still able to stand. The Biscaye was less fortunate. The three-masted schooner from Bilbao had arrived just two days earlier carrying 700 barrels of cod from Saint Pierre and Miquelon. Today its copper-lined hull rests on the harbor floor, still holding barrel after barrel of cod skeletons -- a cargo that helped archaeologists confirm the wreck's identity nearly a century later.

For decades after the eruption, local fishermen were the only ones who knew where the wrecks lay. They cast their nets in spots where fish congregated around the submerged hulls. When scuba diving arrived in the 1970s, wreck hunters followed. Michel Metery and Jean Bally became the principal discoverers, mapping and identifying vessels that the sea had been slowly absorbing for seventy years. The Roraima, first dived in 1983, sits between 40 and 60 meters deep, its iron frame still recognizable, its holds yielding coiled ropes, wine bottles, and rum barrels. The Amelie, a sister ship of the Belem, lies shallow enough to reach by snorkeling. In 2012, the city of Saint-Pierre and the French state formally designated the harbor wrecks as protected cultural heritage. Today the site draws divers from around the world, who descend into warm Caribbean water to touch the copper plating, peer into cargo holds, and confront the speed with which an ordinary morning became a catastrophe. A cannon from Diamond Rock, toppled by the French centuries earlier, was reportedly found during one such dive -- a reminder that Saint-Pierre's harbor holds layers of history far older than 1902.